Die for producing spirally corrugated tubing



y 1 A. PICECE El AL DIE FOR PRODUCING SPIRALLY CORRUGATED TUBING FiledJuly 18, 1928 INVENTOR:

flyzza P162572? & ifzi /ym fwewymzzzz ATTORNEY Patented July 25, 1933UNITED STATES PATENT OFFICE ANGELO PICECE AND STEPHEN GUAIRNASCHELLI, OFLONG ISLAND CITY, NEW YORK DIE FOR PRODUCING SPIRALLY CORRUGATED TUBINGApplication filed July 18, 1928. Serial no. 293,727.

This invention relates to improvements in dies for forming flexiblemetal hose from seamless tubing.

The primary object of the invention resides in a die for helicallycorrugating metal tubing to render the same flexible, and which embodiesa pair of die sections having die plates which co-actto provide acontinuous screw whose diameter and pitch gradually decrease toward thefinish end.

Another object is to provide a'flexible metal hose die which embodies a.pair of die sections, each having removable die plates which may bereplaced when worn or damaged, which is a saving of time and labor overthe present construction of dies which requires the replacement of anentirely new die.

A further object of the invention is the provision of a die of the abovekind in which the die plates are removably secured in the die blocks byremovable pins which may be quickly removed and replaced when making areplacement.

With these and other objects in view, the

invention resides in certain novel construction and combination andarrangement of parts, the essential features of which are hereinafterfully described, are particularly pointed out in the appended claims,and are 80 illustrated in the accompanying drawing in which a Fig. 1 isa side elevation of our die in use,

Fig.2 is an enlarged vertical longitudinal sectional view therethrough,

Fig. 3 is a vertical transverse sectional view on the line 33 of Fig. 2,

Fig. 4 is a fragmentary vertical sectional view on the line H of Fig. 3,and

Fig. 5 is a perspective view of the co-acting die sections in separatedcondition.

Referring to the drawing by reference characters, the numeral 10designates our improved flexible metal hose die in its entirety whichincludes a pair of co-acting die sections 11 and 12.

. The die section 11 comprises a rectangular block or body 13 having asemicircular recess 14 in one of the side faces thereof while removableins 15 extend through the block at diagon y opposite corners thereof.The

faces adjacent the other two corners are proto the longitudinal axis ofthe block, with the' plate A at the greatest angle, plate B at a lesserangle, and plate C at an angle less than the angle of plate B. Theprojection of the arcuate teeth increases from'the plate A to the plateG for a purpose which will be more apparent as the description proceeds.The

plates A, B and C have alined openings 23' therein for register withlongitudinal bores 24 in the block, while key pins 25 extend into thebores and through the alined openings to lock the plates in theirrespective seats.

The die section 12 is similar in construction to the die section 11 andcomprises a block or body 26 ,havin a semicircular recess 27 in one ofits side ames for register with the recess 14 of the die section 11 toprovide an annular bore when the die sections are in an assembledposition. Removable pins 28 extend through the block at diagonallyopposite corners for reception in the sockets 16 of the die section 11,while sockets 29 are provided in the other corners for receiving the.pins 15 of the said die section 11. The pins and sockets tend to alinethe die sections when in assembled position. Seated in spaceddiagonalslots 30, 31 and 32 ci zt inwardly from the recessed face of theblock are die plates A, B and C having arcuate or semicircular teeth 33,34 and 35 respectively extending inwardly beyond the walls of the recess27. The plates A, B and C are arranged at an angle with respect to thelongitudinal axis of the block, with the plate A at the greatest angle,plate B at a lesser angle, and plate C at an angle less than the angleof plate B, or just slightly more than at right angle with respect tothe longitudinal axis of the block. The projection of the teeth 33, 34and 35 in creases from the plate A to the plate C whereby the same coactwith the teeth of the plates A, B and C of the die section 11to proinwhich the key pins 25 and 38 are received to prevent accidental loss ofsaid key pins.

In Figs. 1 and 2 of the drawing, we have illustrated our improved die inassembled position for use, wherein a straight seamless metal tube E isbeing transformed into a helical corrugated flexible tube or hose F. theconvolutions of which are formed by inserting the end of the tube E intothe bore of the die and imparting rotation to the die which feeds thetube therethrough. A mandrel G extends through the tube for guiding thesame as it passes through thedie.

The restricted end of the die thread constitutes the outlet end of thesame, and as the metal tube E is inserted into the larger inlet end ofthe thread, the same forms a crimp or fold in the tube, the walls ofwhich are gradually brought together as the tube is fed from the inletend to the outlet end.

It is appreciated that dies have heretofore been constructed forcorrugating seamless tubes, but our invention aims to provide a die forthis" purpose which may be repaired When the die threads become worn ordamaged. By knocking out the key pins 25 and 38 after the die sectionshave been separated and the pins 15 and 28 removed, the die plates maybe quickly removed and replaced. This effects a saving in both time andlabor, and consequently is less expensive to maintain in perfect workingorder.

While we have described What we deem to be the most desirable embodimentof our invention, it is obvious that many of the details may be variedwithout in any way departing from the spirit of our invention, and wetherefore do not limit ourselves to the exact details of constructionherein set forth nor to anything less than the whole of our inventionlimited only by the appended claims.

What is claimed as new is 1. A device of the character described,comprising a die member formed of two parts having complementaryrecesses, means for positioning and holding said parts so as to alinethem properly, said parts being provided with die plates disposed atdifferent angles, the working edge of said die plates forming acontinuous die thread so that the device may be placed on a tube androtated while the tube is held stationary to form corrugated tubing.

2. A device of the character described, comprising a die member having apair of matlng die sections, each die section including a block having alongitudinal recess in one face thereof, die plates having threadportions extending inwardly from the walls of said recesses, said diesections being assembled to bring the recesses in their respectiveblocks and the die thread portions into alinement and have the diethreadportions form a continuous thread extending from the inner wallsthereof, the device being adapted to be placed on a tube and rotatedwhile the tube is held stationary to form a corrugated tube.

comprising a hollow die having a pair of mating blocks and a mandrelpassing therethrough, said die being provided with a plurality ofgrooves, metallic strips in said grooves and extending toward saidmandrel and spaced therefrom, said strips projecting from the surface ofsaid die by progressively increasing amounts and said grooves beingpositioned at different angles, the device being adapted to be placed ona, tube and rotated while the tube is held stationary to form acorrugated flexible tube. v

4; A device of the character described adapted to be placed on a tubeand rotated While the tube is held stationary to formcorrugated flexibletubing, comprlsing a pair of mating die sections, each die sectioncomprising a body provided with a plurality of slots, die plates seatedin said slots and exedges of said die plates form a continuous diethread extending inwardly therefrom.

ANGELO PIoEoE. STEPHEN GUARNASOHELLLH 3. A device of the characterdescribed, 1-

tending inwardly from thewalls of each 1.

